Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f664dce702627ac…

MALICIOUS

PDF

78.9 KB Created: 2021-08-26 01:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: afead6f68cc0a1dfe3c5419d6033331a SHA-1: 3e92bf048a5d981daaf6cfe79d9ff55f08e0a2ef SHA-256: 4f664dce702627acb6af0030b74d91556485e0b5c69b115a7ddb967d3dc36014
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/uplcv?utm_term=construction+store+keeper PDF link annotation
    • http://danchrisjewelry.com/userfiles/file/varafolal.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/nowajonade.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210621_4E5EFE9688D52717.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091e4474a6f3---64538207764.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-29/images/files/17849807490.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076f00b617f0---51579689883.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac82cea6f77---32614780992.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/4de046d29d98398afd98b313066a77ca/lowurefojekowibodeni.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072743bb86f1---kovivufapenume.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5b7b47f0b---2021308059.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/fb4873b262241831e85d8cb63cc8eddf/67435275539.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/0fa7c40ee83a7aed4ca915193502691d/76161463123.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/xasije.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/dojuso.pdfIn PDF document text
    • https://besteva.com/upload/files/75386243033.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/mopoza.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/kojenefidimerobawoverez.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082daf8a0d50---korukolukaginejalufawo.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/18pv88j2mli9og148qbak3oliu/fonavovamuzo.pdfIn PDF document text
    • https://cristalensi.com/public/File/11632773162.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/rqhi4asou6etk5tklrk87u6oms/44431131303.pdfIn PDF document text
    • http://flirdining.com/uploads/files/dovobobikujonimole.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/vemixuwuxedakip.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD408 16088 bytes
SHA-256: 42cdeb91fc7888646d42d92469f0e6ccfc20588e0152faec4e3a78b4e5ee5f8d
font_01_sfnt_off0000fd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11559 10384 bytes
SHA-256: 7891f81a65a0d6fd0d00737c6d34da2887e99c5e3f15cbbad41f9a963ae52b43

Open this report in the interactive analyzer, or submit your own file for analysis.